QmlDesigner: Hide ToolButtons instead of deleting them
QmlDesigner: Hide ToolButtons instead of deleting them

Task-number: QTCREATORBUG-11900
Change-Id: I009e620a19a1747ea7a1c3580c63e0a56b05564e
Reviewed-by: Alessandro Portale <c4179e69990f13917ee3505a5fdf6c5eb1b74ff4@digia.com>

danimo/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,danimo/qt-creator,colede/qtcreator,xianian/qt-creator,kuba1/qtcreator,omniacreator/qtcreator,kuba1/qtcreator,farseerri/git_code,xianian/qt-creator,AltarBeastiful/qt-creator,amyvmiwei/qt-creator,xianian/qt-creator,colede/qtcreator,omniacreator/qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,kuba1/qtcreator,colede/qtcreator,AltarBeastiful/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,xianian/qt-creator,kuba1/qtcreator,farseerri/git_code,martyone/sailfish-qtcreator,Distrotech/qtcreator,Distrotech/qtcreator,colede/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,Distrotech/qtcreator,colede/qtcreator,colede/qtcreator,farseerri/git_code,omniacreator/qtcreator,danimo/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,Distrotech/qtcreator,farseerri/git_code,Distrotech/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,farseerri/git_code,farseerri/git_code,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,amyvmiwei/qt-creator,maui-packages/qt-creator,maui-packages/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,maui-packages/qt-creator,omniacreator/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,xianian/qt-creator,danimo/qt-creator,kuba1/qtcreator,Distrotech/qtcreator,amyvmiwei/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,Distrotech/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,xianian/qt-creator,xianian/qt-creator,danimo/qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,kuba1/qtcreator,xianian/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,omniacreator/qtcreator,danimo/qt-creator